Work

The influence of grain boundaries on the thermoelectric properties of halide perovskites

Year: 2026

Type: article

Abstract: ABSTRACT Halide perovskites are promising candidates for future thermoelectric applications because of their ultralow thermal conductivity and good Seebeck coefficient. Halide perovskites have the advantages of simple preparation processes, low raw material costs, and adjustable crystal structures. However, the low formation energy of halide perovskites usually results in a polycrystalline structure. The grain boundaries can significantly affect the transport of carriers, phonons, and ions, leading to a decrease in the thermoelectric properties. Understanding and mitigating the effects of grain boundaries on particle transport is critical to understanding the thermoelectric properties of halide perovskites. This paper reviews the influence of grain boundaries on the thermoelectric properties of halide perovskites. First, the latest research on the thermoelectric properties of halide perovskites is summarized. Next, the multiple effects of grain boundary structure on the thermoelectric parameters of halide perovskites are analyzed. The use of grain boundary engineering as an effective method to improve the thermoelectric properties of perovskites is emphasized. Finally, we highlight several problems in the research on the thermoelectric properties of halide perovskites, aiming to provide a reference for future studies.

Source: Materials Today Communications

DOI: 10.1016/j.mtcomm.2026.115726